Doppler展宽的封闭原子系统中无反转增益的相位控制  

Phase control of inversionless gain in a closed atomic system with Doppler broadening

作　　者：马慧[1] 卜凡阁[1] 乔红霞[1] 仝殿民[1] 樊锡君[1] 

机构地区：[1]山东师范大学物理与电子科学学院,济南250014

出　　处：《物理学报》2008年第1期206-211,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10675076);山东省自然科学基金(批准号:2006A21)资助的课题~~

摘　　要：研究了在具有自发辐射诱导相干性的Doppler展宽的封闭Λ型三能级系统中探测场和驱动场之间的相对位相对探测场无反转增益的控制作用.研究结果表明:1)不管探测场和驱动场是同向传播还是反向传播,驱动场是失谐还是共振,无反转增益总是随相对位相的改变而作周期性变化,周期为2π.2)驱动场共振时,无反转增益极大值随Doppler展宽值的增大而单调减小,且反向传播时比同向传播时减小的速度更快;驱动场失谐时,无反转增益的极大值随Doppler展宽值的增大不再单调地减小或增大.在以上两种情况下,均可以通过调节相对相位的数值而得到最大的无反转增益.3)自发辐射诱导相干性对无反转增益的贡献远大于动力学相干性的贡献.We studied the controlling role played by the relative phase between the probe and driving fields on inversionless gain of the probe field in a closed and Doppler broadened A-type three-level system with spontaneously generated coherence （SGC）. It was found that：（1） Regardless of the driving field being in or off resonance, and regardless of the probe and driving fields being coor counter-propagating, the gain maximum value always varies periodically with variation of the relative phase with the period 2π. （2） When the driving field is in resonance, the gain maximum value decreases monotonicly with Doppler width increasing, and moreover, the decreasing in the counter-propagation case is faster than that in the co-propagation case. When the driving field is off resonance, the gain maximum value does not monotonicly decrease or increase with Doppler width increasing. In both above cases, the largest inversionless gain can be gotten by adjusting the relative phase. （3） The contribution of SGC to the inversionless gain is much larger than that of the dynamically induced coherence.

关 键 词：自发辐射诱导相干 相位控制 Doppler展宽 无反转增益 

分 类 号：O431.2[机械工程—光学工程]